ListView using Array from strings.xml with Item Click Listener

<resources>
    <string name="app_name">My Application</string>

    <string-array name="items">
        <item>Item 1</item>
        <item>Item 2</item>
        <item>Item 3</item>
        <item>Item 4</item>
    </string-array>

</resources>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <ListView
        android:id="@+id/list_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</LinearLayout>

package com.jigopost.myapplication;

import android.content.DialogInterface;
import android.content.res.Resources;
import android.os.Bundle;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

public class MainActivity extends AppCompatActivity {

    ListView listView;
    String[] items;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Resources res = getResources();

        items = res.getStringArray(R.array.items);

        listView = (ListView) findViewById(R.id.list_view);

        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
                android.R.layout.simple_list_item_1, android.R.id.text1, items);

        listView.setAdapter(adapter);

        listView.setOnItemClickListener(new AdapterView.OnItemClickListener()
        {
            public void onItemClick(AdapterView<?> parent, View view, int position, long id)
            {

                if (position == 0) {
                    Toast.makeText(MainActivity.this, "Item One Clicked", Toast.LENGTH_SHORT).show();
                }
                else if (position == 1) {
                    Toast.makeText(MainActivity.this, "Item Two Clicked", Toast.LENGTH_SHORT).show();
                }
                else if (position == 2) {
                    Toast.makeText(MainActivity.this, "Item Three Clicked", Toast.LENGTH_SHORT).show();
                }
                else if (position == 3) {
                    Toast.makeText(MainActivity.this, "Item Four Clicked", Toast.LENGTH_SHORT).show();
                }

            }
        });
    }
}